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-rw-r--r--mm/mmap.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 22e1a0b..da15a79 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1266,8 +1266,9 @@ munmap_back:
vma->vm_pgoff = pgoff;
INIT_LIST_HEAD(&vma->anon_vma_chain);
+ error = -EINVAL; /* when rejecting VM_GROWSDOWN|VM_GROWSUP */
+
if (file) {
- error = -EINVAL;
if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP))
goto free_vma;
if (vm_flags & VM_DENYWRITE) {
@@ -1607,7 +1608,6 @@ EXPORT_SYMBOL(find_vma);
/*
* Same as find_vma, but also return a pointer to the previous VMA in *pprev.
- * Note: pprev is set to NULL when return value is NULL.
*/
struct vm_area_struct *
find_vma_prev(struct mm_struct *mm, unsigned long addr,
@@ -1616,7 +1616,16 @@ find_vma_prev(struct mm_struct *mm, unsigned long addr,
struct vm_area_struct *vma;
vma = find_vma(mm, addr);
- *pprev = vma ? vma->vm_prev : NULL;
+ if (vma) {
+ *pprev = vma->vm_prev;
+ } else {
+ struct rb_node *rb_node = mm->mm_rb.rb_node;
+ *pprev = NULL;
+ while (rb_node) {
+ *pprev = rb_entry(rb_node, struct vm_area_struct, vm_rb);
+ rb_node = rb_node->rb_right;
+ }
+ }
return vma;
}
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